I have 28days cycle never missed which day i ovulate plzzz help trying to conceive had miscarriage last june 2012 since then trying minus 5 months?

OK: Would suggest not checking for ovulation if you have regular 28 day cycles. This produces anxiety and stress that works against you for successful pregnancy. Ovulation will occur between days 13-15 each month. Timing of intercourse more accurately than every 48 hours (roughly) will not increase your pregnancy rate. So from cd 11-18 every other day is your best chance. More time then seek help.